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| author | Andrey Smirnov <andrew.smirnov@gmail.com> | 2015-04-13 05:12:06 -0700 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2015-04-14 20:47:49 +0200 |
| commit | 16df43459255745465f296610be1000ab9165fa2 (patch) | |
| tree | b499740b105b94b0f4122108f2e2ef9912e5a43d /drivers/spi | |
| parent | 11491a18a1f579df4de8321a540b0c8420169714 (diff) | |
| download | barebox-16df43459255745465f296610be1000ab9165fa2.tar.gz barebox-16df43459255745465f296610be1000ab9165fa2.tar.xz | |
spi: i.MX: Respect the value of 'cs_change'
Add the code to correctly handle 'cs_change' field in 'struct
spi_transfer'(base on the similar code from altera_spi.c)
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/imx_spi.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/drivers/spi/imx_spi.c b/drivers/spi/imx_spi.c index a1f19eba8b..e552d5fe01 100644 --- a/drivers/spi/imx_spi.c +++ b/drivers/spi/imx_spi.c @@ -29,6 +29,7 @@ #include <mach/generic.h> #include <linux/clk.h> #include <linux/err.h> +#include <clock.h> #define CSPI_0_0_RXDATA 0x00 #define CSPI_0_0_TXDATA 0x04 @@ -457,17 +458,34 @@ static int imx_spi_transfer(struct spi_device *spi, struct spi_message *mesg) { struct imx_spi *imx = container_of(spi->master, struct imx_spi, master); struct spi_transfer *t; + unsigned int cs_change; + const int nsecs = 50; imx->chipselect(spi, 1); + cs_change = 0; + mesg->actual_length = 0; list_for_each_entry(t, &mesg->transfers, transfer_list) { + if (cs_change) { + ndelay(nsecs); + imx->chipselect(spi, 0); + ndelay(nsecs); + imx->chipselect(spi, 1); + } + + cs_change = t->cs_change; + imx_spi_do_transfer(spi, t); mesg->actual_length += t->len; + + if (cs_change) + imx->chipselect(spi, 1); } - imx->chipselect(spi, 0); + if (!cs_change) + imx->chipselect(spi, 0); return 0; } |